Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos anos Louis Armstrong estava se apresentando?
 ###Tabelas: CREATE TABLE most_played_songs (most_played_songs_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Song title VARCHAR, Composer(s) VARCHAR, Performer(s) VARCHAR, Year INT) CREATE TABLE filmfare_awards (filmfare_awards_id AUTO_INCREMENT PRIMARY KEY, Year INT, Song VARCHAR, Film VARCHAR, Music director(s) VARCHAR, Lyricist VARCHAR) CREATE TABLE past_opponents (past_opponents_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Competition VARCHAR, Round VARCHAR, Club VARCHAR, 1st leg VARCHAR) CREATE TABLE list_of_the_50_largest_country_subdivisions_by_area (list_of_the_50_largest_country_subdivisions_by_area_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Subdivision name VARCHAR, Country VARCHAR, Area (km²) INT, Population INT) CREATE TABLE "ivy_bridge_quad-core"_22_nm ("ivy_bridge_quad-core"_22_nm_id AUTO_INCREMENT PRIMARY KEY, Model number VARCHAR, sSpec number VARCHAR, Cores VARCHAR, Frequency VARCHAR, Turbo VARCHAR, L2 cache VARCHAR, L3 cache VARCHAR, GPU model VARCHAR, GPU frequency VARCHAR, Socket VARCHAR, I/O bus VARCHAR, Release date VARCHAR, Part number(s) VARCHAR, Release price ( USD ) VARCHAR)  
SELECT COUNT Year FROM most_played_songs WHERE Performer(s) = louis armstrong